<!--
Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->

<!--
`core-scroll-header-panel` contains a header section and a content section.  The
header is initially on the top part of the view but it scrolls away with the 
rest of the scrollable content.  Upon scrolling slightly up at any point, the 
header scrolls back into view.  This saves screen space and allows users to
access important controls by easily moving them back to the view.

__Important:__ The `core-scroll-header-panel` will not display if its parent does not have a height.

Using [layout attributes](http://www.polymer-project.org/docs/polymer/layout-attrs.html), you can easily make the `core-scroll-header-panel` fill the screen

    <body fullbleed layout vertical>
      <core-scroll-header-panel flex>
        <core-toolbar>
          <div>Hello World!</div>
        </core-toolbar>
      </core-scroll-header-panel>
    </body>

or, if you would prefer to do it in CSS, just give `html`, `body`, and `core-scroll-header-panel` a height of 100%:

    html, body {
      height: 100%;
      margin: 0;
    }
    core-scroll-header-panel {
      height: 100%;
    }

`core-scroll-header-panel` works well with `core-toolbar` but can use any element 
that represents a header by adding a `core-header` class to it.  Use the attribute 
or class `content` to delineate the content section.

    <core-scroll-header-panel>
      <core-toolbar>Header</core-toolbar>
      <div content>Content goes here...</div>
    </core-scroll-header-panel>

@group Polymer Core Elements
@element core-scroll-header-panel
@homepage github.io
-->

<link rel="import" href="../polymer/polymer.html">

<polymer-element name="core-scroll-header-panel">
<template>

  <link rel="stylesheet" href="core-scroll-header-panel.css">

  <div id="mainContainer">
  
    <content id="mainContent" select="[content], .content"></content>
    
  </div>
  
  <div id="headerContainer">
  
    <div class="bg-container">
      <div id="condensedHeaderBg"></div>
      <div id="headerBg"></div>
    </div>
    
    <content id="headerContent" select="core-toolbar, .core-header"></content>
    
  </div>
  
</template>
<script src="core-scroll-header-panel.js"></script>
</polymer-element>
